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Reasons and improvement measures for flaw detection disqualification of thick A387Gr22CL1 pressure v steel plate

By means of metallography and scanning electron microscope, we made analysis for the unqualified internal structure and law detection of thick gauge A387Gr22CL1 pressure vessel plates. It shows that the microcracks caused by inclusions are the main reason for the failure of A387Gr22CL1 pressure vessel steel plates flaw detection.

The measures to reduce the superheat of molten steel, such as dynamic soft reduction technology, billet and steel plate stacking and slow cooling 48h are put forward. Those methods can effectively improve the qualification rate of A387Gr22CL1 pressure vessel steel plates flaw detection.

The A387Gr22CL1 pressure vessel steel plates are very strict in production and inspection because of their special use. Generally A387Gr22CL1 vessel plates need ultrasonic flaw detection to detect quality defects inside the A387Gr22CL1 steel plates. Ultrasonic flaw detection has become an important means of steel plate inspection for boiler and pressure vessel steel.

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